【高二英语试题精选】2018年高二英语上学期期中试题(带答案)
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2018年高二英语上学期期中试题（带答案） K
j friendly sport Power walking is one of them that you could take up today You don’t need any special equipment except a good pair of shoes; and you don’t have to worry about resources and your purse Simple and free, power walking can also keep you fit If you walk regularly, it will be good for your heart and bones Experts say that friendly sports
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Two recent studies have found that punishment is not the best way to influence behavior．
One showed that adults are much more cooperative if they work in a system based on rewards Researchers at Harvard University in the United States and the Stockholm School of Economics in Sweden did the study
They had about two hundred college students play a version of the game known as the Prisoner’ s Dilemma The game is based on the tension between the interests of an individual and a group The students played in groups of four Each player could win points for the group, so they would all gain equally But each player could also reward or punish each of the other three players Harvard researcher David Rand says the most successful behavior proved to be cooperation The groups that rewarded it the most earned about twice as much in the game as the groups that rewarded it the least And the more a group punished itself, the lower its earnings The study appeared last month in the journal Science
The other study involved children It was presented last month in California at a conference on violence and abuse。